1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



7 i 



4. Leaflets oval to oblong-obovate, apically rounded and retuse to emarginate. 



(17. 31. microcalyx) 5. 



4. Leaflets lanceolate, apically acute. 14. 31. jemmanii. 



5. Ovary villose on all surfaces. 17a. If. microcalyx var. microcalyx. 



5. Ovary villose only marginally, laterally glabrous. 6. 



6. Leaflets oval-oblong to oblong-obovate, the apex rounded, the lower surface glaucous; 

 stipules caducous. 7. 



6. Leaflets oval to elliptic, the apex attenuate but finally obtuse, the lower surface 



not glaucous; stipules persistent 20. 31. guianense. 



7. Leaflets mostly 3-5 cm long, 3-7-jugate, the rachis 2.5-10 cm long. 15. M. discolor & var. 



7. Leaflets always less than 2 cm long, 2-3-jugate, the rachis 0.7-1.7 cm long. 



17b. 31. microcalyx var. minimum. 



8. Leaflets distinctly punctate on the lower surface, oblong, 2.5-3.5 times as long as 

 wide. Pedicels ca. 12 mm long. Bracteoles 12-17 mm long. 15'. 31. longipes. 



8. Leaflets epunctate, not over 2 times as long as wide, more or less oval to suborbicular. 

 Pedicels 4-7 mm long. Bracteoles 5.5-10 mm long. 9. 



9. Leaflets 2-3-jugate. Bracteoles pubescent on one or on both surfaces; filaments 

 10-20 mm long, villosulose basally or glabrous. 18. M. montannm &: vars. 



9. Leaflets 5-7-jugate. Bracteoles glabrous; filaments 25-35 mm long, strongly villose. 



19. 31. urupaense. 



Key to Species of Series lc 



1. Leaflets 10-16-jugate. 2. 



1. Leaflets usually less than 10-jugate . 3. 



2. Leaflets pubescent beneath, oblong. Ovary pubescent at least marginally; filaments 

 pubescent. 11. M. flexuosum. 



2. Leaflets glabrous, oval oblong. Ovary glabrous ; filaments glabrous. 12. 31. furcatum. 



3. Leaflets not punctate. 4. 



3. Leaflets punctate. 8. 



4. Leaflets velvety-pubescent. Inflorescence pilosulose 13. 31. molle. 



4. Leaflets glabrous or at least not velvety. Inflorescence not pilosulose. 5. 



5. Ovary pubescent on the margins. Leaflets with the lower surface often glacuous to 

 ceriferous. . 6. 



5. Ovary glabrous. Leaflets not at all glaucous or ceriferous. 19. 31. urupaense. 



6. Leaflets oblong or oblong-oval to oblong obovate, 5-35 mm wide, glaucous to 

 ceriferous beneath. 7. 



6. Leaflets linear, not over 3.5 mm wide, not glaucous or ceriferous beneath. 



2'. M. cataract arum. 



7. Leaflets oblong, 12-23 mm long, 5-8 mm wide. Pedicels 1-1.5 mm long. 



11'. 31. anomalum. 



7. Leaflets usually oblong-oval to oblong-obovate, mostly 45-70 mm long and 10-35 mm 

 wide. Pedicels usually 2-5 mm long. 15. M. discolor & vars. 



8. Peduncle 2-4 mm long, the pedicels ca. 12 mm long. Leaflets 1-3-jugate. Fruits 

 oblong. 15'. 31. longipes. 



8. Peduncle 10-55 mm long, the pedicels 2-5.5 mm long. Leaflets 3-9-jugate. Fruits 



oval to suborbicular. 16. 31. multijugum. 



Key to Species of Series Id 



1. Leaflets 10-30- jugate (-40-jugate in one variety of 31. gracile), plane or nearly so. 



Hypanthium cupular. 2. 



1. Leaflets 35-45-jugate, strongly convex. Hypanthium short-cylindric. 1. 31. taxifolium. 



2. Pedicels averaging G mm long (4-8 mm) ; bracteoles glabrous. Stipules persistent 



or caducous. 3. 



2. Pedicels shorter ; bracteoles pubescent on outer surface only or on both inner and 

 outer surfaces. Stipules caducous. 4. 



3. Stipules persistent ; leaves oblong to lanceolate-oblong in outline, the leaflets rounded 

 apically, entire or subentire. Bracts 3.5-5.5 mm long, 1-1.5 mm wide. 5. 31. liuberiannm. 



3. Stipules caducous; leaves elliptic or lanceolate in outline, the leaflets truncate 

 apically, retuse to emarginate. Bracts 8 mm long, 2.5 mm wide. 



6. 31. longipedicellatum. 



4. Ovary arid bracteoles glabrous; peduncle 4-6 mm long. 12. 31. furcatum. 

 4. Ovary and bracteoles more or less pubescent ; peduncle shorter. 5- 



